meld

Aspect Oriented Programming for Javascript. It allows you to change the behavior of, or add behavior to methods and functions (including constructors) non-invasively.
As a simple example, instead of changing code, you can use meld to log the result of myObject.doSomething:

var myObject = {
	doSomething: function(a, b) {
		return a + b;
	}
};

// Call a function after myObject.doSomething returns
var remover = meld.after(myObject, 'doSomething', function(result) {
	console.log('myObject.doSomething returned: ' + result);
});

myObject.doSomething(1, 2); // Logs: "myObject.doSomething returned: 3"

remover.remove();

myObject.doSomething(1, 2); // Nothing logged

• API
• Reference
• Aspects

AMD

1. Get it using one of the following

1. `yeoman install meld`, or
1. `bower install meld`, or
1. `git clone https://github.com/cujojs/meld`, or
1. `git submodule add https://github.com/cujojs/meld`

1. Configure your loader with a package:

```js
packages: [
	{ name: 'meld', location: 'path/to/meld', main: 'meld' },
	// ... other packages ...
]
```

1. define(['meld', ...], function(meld, ...) { ... }); or require(['meld', ...], function(meld, ...) { ... });

Node

1. npm install meld
2. var meld = require('meld');

RingoJS

1. ringo-admin install cujojs/meld
2. var meld = require('meld');

Install buster.js
npm install -g buster
Run unit tests in Node:
buster test

1.3.0

• meld() is now a function that adds aspects.

* **DEPRECATED:** `meld.add()`.  Use `meld()` instead.

1.2.2

• Remove stray console.log.

1.2.1

• Fix for IE8-specific issue with meld's internal use of Object.defineProperty.
• Internally shim Object.create if not available to so that meld no longer requires an Object.create shim to advise constructors in pre-ES5 environments.

1.2.0

• meld.joinpoint() - Access the current joinpoint from any advice type.
• Bundled aspects:

* trace: trace method call entry/return/throw
* memoize: simple memoization for methods and functions
* cache: configurable caching aspect to do more than simple memoization

1.1.0

• Advice can be applied directly to methods on a function.
• Removed undocumented behavior that implicitly adds constructor prototype advice: to advise a prototype, pass the prototype as the advice target.

1.0.0

• Removed browser global - window.meld is no longer supported. See this post on the cujo.js Google Group for an explanation.
• No functional change beyond browser global removal.

See the full Changelog here

• AspectJ and Spring Framework AOP for inspiration and great docs
• Implementation ideas from @phiggins42's uber.js AOP
• API ideas from jquery-aop